We drew on a Bank of America report to put together 15 companies with the most exposure to the U.S. government. The health care and defense sectors receive the biggest chunk of their revenues from the government.

Less than 10% of S&P 500 revenues come from the U.S. government. 35% of S&P 500 government exposure is for defense, while 40% is to health care. If automatic funding cuts kick-in, Bank of America predicts that defense will take $492 billion hit and Medicare will take a $123 billion hit in the next decade.

#5 L-3 Communications Holdings Inc.

L-3 Communications supplies communications-related products to the Department of Defense, Department of Homeland Security, U.S. Government intelligence agencies, NASA and aerospace contractors among others.